Email是可数名词，表示一封电子邮件时用an Email，多封电子邮件用some Email。例句：Multiple email addresses have been added.增加了多个电子邮件地址。
例句
1、Can you explain how the email system works?
你能说明一下电子邮件系统的工作原理吗？
2、Each student has been given his or her own email address.
每个学生都得到一个自己的电子邮件地址。
3、Clients can now contact us by email out of hours.
现在于办公时间以外顾客可以用电邮和我们联系。
4、Each student has been given their own email address.
每个学生都得到一个自己的电子邮件地址。
5、Please mail us at the following email address.
请按下面的电邮地址发送给我们。